WO2014085577A1 - Détection d'une main sur un volant au moyen d'un élément chauffant - Google Patents

Détection d'une main sur un volant au moyen d'un élément chauffant Download PDF

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Publication number
WO2014085577A1
WO2014085577A1 PCT/US2013/072214 US2013072214W WO2014085577A1 WO 2014085577 A1 WO2014085577 A1 WO 2014085577A1 US 2013072214 W US2013072214 W US 2013072214W WO 2014085577 A1 WO2014085577 A1 WO 2014085577A1
Authority
WO
WIPO (PCT)
Prior art keywords
steering wheel
electrode
occupant
sensing
electrodes
Prior art date
Application number
PCT/US2013/072214
Other languages
English (en)
Inventor
Phillip B. MAGUIRE
Jeff Bennett
Original Assignee
Tk Holdings Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tk Holdings Inc. filed Critical Tk Holdings Inc.
Priority to EP13857766.3A priority Critical patent/EP2925583B1/fr
Priority to JP2015545433A priority patent/JP6783520B2/ja
Priority to ES13857766.3T priority patent/ES2679396T3/es
Publication of WO2014085577A1 publication Critical patent/WO2014085577A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/04—Hand wheels
    • B62D1/046—Adaptations on rotatable parts of the steering wheel for accommodation of switches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/04—Hand wheels
    • B62D1/06—Rims, e.g. with heating means; Rim covers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/04—Hand wheels
    • B62D1/06—Rims, e.g. with heating means; Rim covers
    • B62D1/065—Steering wheels with heating and ventilating means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon

Definitions

  • the present application relates generally to the field of occupant sensor systems.
  • this application relates to an improved steering wheel system which is configured to be used to determine the proximity of a hand of an occupant of the vehicle and generate heat for the driver (e.g., via a heating element).
  • Various occupant sensor systems are known in the art which use electrodes to sense a presence of an occupant.
  • a vehicle with heating elements in particular locations (e.g., a vehicle seat, a vehicle steering wheel, etc.) which a vehicle occupant contacts, so as to provide warmth to the occupant and improve the occupant's driving experience. Difficulties may arise when trying to design an occupant sensor system which use electrodes to sense a presence of an occupant which is in relative close proximity to a heating element configured to provide warmth to the occupant. For example, without a shield layer positioned between an electrode and a heating element, the electrical coupling between the electrode and the heating element may be greater than the electrical coupling between a vehicle occupant and the electrode. As a result, the presence of the occupant may not be reliably determined by the electrode. Further, including a shield layer between sensor electrodes and a heating element may be prohibitively costly and difficult to package.
  • a steering wheel system for a vehicle may include a steering wheel configured to be gripped by an occupant and a first electrode positioned within a first sensing zone on the steering wheel.
  • the first electrode may be configured to generate heat when a first signal is supplied to the first electrode.
  • the first electrode may be configured to be used to determine the proximity of a hand of an occupant of the vehicle to the first sensing zone when a second signal is supplied to the first electrode.
  • the steering wheel system may also include a controller configured to control the supply of the first and second signals to the first electrode based on the proximity of the hand of the occupant to the first sensing zone.
  • a steering wheel system for a vehicle may include a steering wheel, a first electrode positioned within a first sensing zone on the steering wheel, and a second electrode positioned within a second sensing zone on the steering wheel.
  • Each of the first and second electrodes may be configured to generate heat when a first signal is supplied to the electrode, and each of the first and second electrodes may be configured to be used to determine the proximity of a hand of an occupant of the vehicle to one of the sensing zones when a second signal is supplied to the electrode.
  • the steering wheel system may also include a sensing circuit for determining the proximity of the hand of an occupant of the vehicle to one of the sensing zones based on the second signal supplied to the first and second electrodes.
  • FIG. 1 is a perspective view of a vehicle interior.
  • FIG. 2 is a schematic front view of a steering wheel including an occupant sensing system which includes a plurality of heater zones, according to an exemplary embodiment.
  • FIG. 3 is a schematic diagram of an occupant sensing system having a parallel configuration.
  • FIG. 4 is a schematic diagram of an occupant sensing system having another parallel configuration.
  • FIG. 5 is a schematic diagram of an occupant sensing system having a series configuration.
  • the occupant detection system employed with the steering wheel system may be similar to the systems disclosed in U.S. Published Application No. 2007/0192007
  • the sensing circuit e.g., the ASIC
  • the sensing circuit could be designed to provide data relating to the change in the complex impedance described in the foregoing application in order to detect that an occupant's hand is proximate to the steering wheel.
  • the between the operation of the heater and the sensing system could employ the methodology and structural features disclosed in U.S. Patent No. 7,521,940 (incorporated by reference herein).
  • a vehicle driver may operate a vehicle from a cockpit (vehicle interior) 10 with a steering wheel 12 and a vehicle seat (e.g., the driver's seat 13). When sitting on the driver's seat 13, the driver may rotate the steering wheel 12 to turn the vehicle wheels and steer the vehicle in a desired direction.
  • the steering wheel 12 may also include various controls in the form of switches or buttons provided within easy reach of the driver, such as controls for a vehicle audio system (e.g., volume, tuning, mode, etc.), controls for vehicle lighting (e.g., overhead lighting, headlights, etc.), phone controls, cruise control, or other suitable control.
  • the steering wheel 12 may include any combination of the controls disclosed herein, according to various exemplary embodiments, and that these configurations are not intended to limit the possible arrangements of controls provided on the steering wheel 12.
  • elements used in one exemplary embodiment may be used in various combinations with elements used in another exemplary embodiment.
  • the steering wheel 12 is shown having a particular design.
  • the steering wheel 12 may include a ring-like outer portion 14 and an inner portion 15 coupled to a steering column of the vehicle.
  • the outer portion 14 may be formed of a rigid frame or armature, which may be partially covered by an outer layer (e.g., a skin, covering, wrap, etc.).
  • the outer layer may be configured to provide an aesthetically pleasing exterior for the steering wheel 12 and add an ergonomically pleasing layer (i.e., such that the skin improves the ergonomics, feel, grip, etc. of the steering wheel 12) to an outer surface of the steering wheel 12.
  • an ergonomically pleasing layer i.e., such that the skin improves the ergonomics, feel, grip, etc. of the steering wheel 12
  • the outer portion 14 of the steering wheel 12 may include one or more heater zones 16.
  • the heater zones may be configured to be selectively activated to warm the hands of the driver.
  • the heater zones 16 may include a resistive heating element 18 (not shown in FIG. 2, but see, e.g., FIGS. 3-5).
  • the number, location, and configuration of the heater zones 16 as shown in the figures is exemplary, and is not intended to limit the possible various configurations of heater zones provided on a steering wheel.
  • the steering wheel 12 may include a greater or fewer number of heater zones 16 then shown in the figures.
  • the heater zones 16 may be provided in any suitable place on the steering wheel 12 (e.g., along the outer portion 14 or on the inner portion 15).
  • a steering wheel system 20 may include at least one heater zone 16.
  • the steering wheel system 20 may include a sensing circuit configured to detect the presence of the driver (e.g., a portion of the driver's body, such as the driver's legs, hands, etc.).
  • the sensing circuit may be configured in various ways.
  • the sensing circuit may be an ASIC, an integrated circuit, or have any other suitable configuration.
  • the sensing circuit may include a controller, such as the processor 22.
  • an electrode e.g., a heating element 18 is positioned within a sensing zone (e.g., a heater zone 16) of the steering wheel 12.
  • the steering wheel system 20 may include any suitable number of such electrodes positioned within any suitable number of sensing zones.
  • the electrode may be used to provide warmth for a vehicle occupant when a heating signal (e.g., a first signal) is supplied to the electrode (i.e., the electrode may generate heat for the driver's hands). Further, the electrode may be used to determine the proximity of a hand of an occupant of the vehicle to the sensing zone when a sensing signal (e.g., a second signal) is supplied to the electrode.
  • a heating signal e.g., a first signal
  • the heating signal may carry a higher current relative to the sensing signal.
  • the electrode is cooperatively configured to be used as a sensor and a heater.
  • the electrode may alleviate (i.e., reduce, improve, lessen, etc.) the costs and the packaging difficulties associated with adding a separate sensor and shield over a top of a heating element for a heater zone.
  • the electrode may be coupled to a vehicle power supply (e.g., the vehicle's DC bus which may be supplied power by a batter or alternator, for example). Further, the vehicle power supply may be used to supply the heating signal to the electrode.
  • vehicle power supply e.g., the vehicle's DC bus which may be supplied power by a batter or alternator, for example.
  • the vehicle power supply may be used to supply the heating signal to the electrode.
  • the steering wheel system 20 may include a variety of controls, sensors, and other elements used to control or regulate the heating signal, so as to control the temperature of the heater zone (so the steering wheel 12 does not overheat).
  • the sensing circuit (which may include an electronic controller) is configured to control the supply of the sensing signal and the heating signal to the electrode based on the proximity of the hand of the occupant to a sensing zone.
  • the sensing circuit may not supply the heating signal to the electrode until or unless a hand is detected in proximity to the heater zone.
  • the steering wheel system 20 may be configured to automatically supply a heating signal to the electrode when a hand is sensed.
  • the controller is configured to supply the heating signal and the sensing signal to the electrode on an alternating basis at a predetermined time interval. Further, the heating and sensing signals may be time-multiplexed between multiple electrodes, according to how multiple electrodes are arranged in the steering wheel system 20 (i.e., whether multiple electrodes are arranged in parallel or series).
  • the steering wheel system 20 may include a variety of inductors positioned in-line with the heating element 18.
  • the inductors may function as a switch, so as to switch between a high impedance in a sensing mode and a low impedance in a heating mode.
  • the inductors may have any suitable impedance at the sensing frequency in the sensing mode and at the heating frequency in the heating mode.
  • An inductor may be any suitable inductor, such as a field-effect transistor (FET), diodes, and a common mode choke.
  • FET field-effect transistor
  • a switch load may be used in the sensing mode to calibrate the electrode.
  • a driven shield signal may be imposed to shield a sensing signal from the inductors.
  • a multi-measurement approach may be utilized which may involve applying multiple driven shield signal levels to the shielded nodes and switching in impedance between the sensor and shield nodes. In this way, an error caused by (i.e., resulting from, attributed to, etc.) the configuration of inductors (i.e., the measurement architecture) may be reduced, cancelled, lessened, etc.
  • FIGS. 3-5 various architectural examples for the sensor systems 20 are shown with the high-side and low-side FETs shown as switches 26a, 26b, respectively.
  • an impedance source may include FETs, diodes, inductors, a common mode choke, or any other suitable element having an appropriate impedance.
  • the sensor system 20 is shown as having a parallel heating setup where the sensing and heating is time multiplexed.
  • the sensor system 20 may include a high-side switch 26a and a low-side switch 26b for multiple heater zones 16.
  • each heater zone 16 may include an isolation impedance source (i.e., an inductor), shown as switch 24, on either side of the heating element 18.
  • the sensor system 20 may be configured to sense the presence of a vehicle occupant when heating is off for all heater zones 16. It should be understood by those skilled in the art that, while two heater zones 16 and two sensors are shown in FIG. 3, the sensor system 20 could be configured to include any number of heater zones and any number of sensors.
  • the sensor system 20 may include a parallel heating setup in which an occupant sensing function and a heating function are time-multiplexed for individual sensing/heating zones.
  • the sensor system 20 shown in FIG. 4 is configured to simultaneously sense the presence of an occupant in a first heater zone 16a and provide warmth/heat in a second heater zone 16b.
  • the first and second heater zones 16a, 16b may alternate (i.e., switch) functions, such that the sensor system 20 is configured to simultaneously sense the presence of an occupant in the second heater zone 16b and provide warmth/heat in the first heater zone 16a.
  • a high-side switch 26a and a low-side switch 26b is provided for each of the heater zones 16a, 16b. It should be understood by those skilled in the art that, while two heater zones 16 and two sensors are shown in FIG. 4, the sensor system 20 could be configured to include any number of heater zones and any number of sensors.
  • the sensor system 20 may include a series heating setup in which an occupant sensing function and a heating function are time-multiplexed.
  • the sensor system 20, as shown in FIG. 5, may include a high-side switch 26a and a low-side switch 26b.
  • the sensor system 20 shown in FIG. 5 may include less isolation impedance sources (e.g., switches 24) when compared to a parallel design (e.g., as described above and shown in FIGS. 3-4).
  • a parallel design e.g., as described above and shown in FIGS. 3-4
  • the sensor system 20 having a series design may sense the presence of an occupant in a single heater zone 16 if a heating function for each heater zone 16 is off. It should be understood by those skilled in the art that, while three heater zones 16 and three sensors are shown in FIG. 5, the sensor system 20 could be configured to include any number of heater zones and any number of sensors.
  • the term “coupled” means the joining of two components (electrical, mechanical, or magnetic) directly or indirectly to one another. Such joining may be stationary in nature or movable in nature. Such joining may be achieved with the two components (electrical or mechanical) and any additional intermediate members being integrally defined as a single unitary body with one another or with the two
  • Exemplary embodiments may include program products comprising computer or machine-readable media for carrying or having machine-executable instructions or data structures stored thereon.
  • the sensors and heating elements may be computer driven.
  • Exemplary embodiments illustrated in the methods of the figures may be controlled by program products comprising computer or machine-readable media for carrying or having machine-executable instructions or data structures stored thereon.
  • Such computer or machine-readable media can be any available media which can be accessed by a general purpose or special purpose computer or other machine with a processor.
  • Such computer or machine-readable media can comprise RAM, ROM, EPROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to carry or store desired program code in the form of machine-executable instructions or data structures and which can be accessed by a general purpose or special purpose computer or other machine with a processor.
  • Computer or machine-executable instructions comprise, for example, instructions and data which cause a general purpose computer, special purpose computer, or special purpose processing machines to perform a certain function or group of functions.
  • Software implementations of the present disclosure could be accomplished with standard programming techniques with rule based logic and other logic to accomplish the various connection steps, processing steps, comparison steps and decision steps.
  • elements shown as integrally formed may be constructed of multiple parts or elements shown as multiple parts may be integrally formed, the operation of the assemblies may be reversed or otherwise varied, the length or width of the structures and/or members or connectors or other elements of the system may be varied, the nature or number of adjustment or attachment positions provided between the elements may be varied.
  • the elements and/or assemblies of the system may be constructed from any of a wide variety of materials that provide sufficient strength or durability. Accordingly, all such modifications are intended to be included within the scope of the present disclosure.
  • the order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments.
  • Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the preferred and other exemplary embodiments without departing from the spirit of the present subject matter.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Steering Controls (AREA)

Abstract

La présente invention concerne un système de volant d'un véhicule, comprenant un volant conçu pour être saisi par un occupant et une première électrode disposée à l'intérieur d'une première zone de détection sur le volant. Selon l'invention, la première électrode est conçue pour générer de la chaleur lors de l'application d'un premier signal à la première électrode. La première électrode est conçue pour être utilisée afin de déterminer la proximité d'une main d'un occupant du véhicule par rapport à la première zone de détection lors de l'application d'un second signal à la première électrode. Le système de volant comprend également un organe de commande conçu pour commander l'application des premier et second signaux à la première électrode sur la base de la proximité de la main de l'occupant par rapport à la première zone de détection.
PCT/US2013/072214 2012-11-30 2013-11-27 Détection d'une main sur un volant au moyen d'un élément chauffant WO2014085577A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13857766.3A EP2925583B1 (fr) 2012-11-30 2013-11-27 Détection d'une main sur un volant au moyen d'un élément chauffant
JP2015545433A JP6783520B2 (ja) 2012-11-30 2013-11-27 加熱要素を用いたステアリングホイールのハンドセンサ
ES13857766.3T ES2679396T3 (es) 2012-11-30 2013-11-27 Detección de mano en volante utilizando elemento calentador

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201261731756P 2012-11-30 2012-11-30
US61/731,756 2012-11-30

Publications (1)

Publication Number Publication Date
WO2014085577A1 true WO2014085577A1 (fr) 2014-06-05

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Family Applications (1)

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PCT/US2013/072214 WO2014085577A1 (fr) 2012-11-30 2013-11-27 Détection d'une main sur un volant au moyen d'un élément chauffant

Country Status (5)

Country Link
US (1) US9346480B2 (fr)
EP (1) EP2925583B1 (fr)
JP (1) JP6783520B2 (fr)
ES (1) ES2679396T3 (fr)
WO (1) WO2014085577A1 (fr)

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EP2925583A1 (fr) 2015-10-07
EP2925583A4 (fr) 2016-07-27
JP2015536275A (ja) 2015-12-21
ES2679396T3 (es) 2018-08-27
JP6783520B2 (ja) 2020-11-11
US9346480B2 (en) 2016-05-24
US20140151356A1 (en) 2014-06-05
EP2925583B1 (fr) 2018-05-02

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